1021230155 has 32 divisors (see below), whose sum is σ = 1385477568. Its totient is φ = 716083200.

The previous prime is 1021230139. The next prime is 1021230209. The reversal of 1021230155 is 5510321201.

It is a happy number.

It is not a de Polignac number, because 1021230155 - 2⁴ = 1021230139 is a prime.

It is a super-2 number, since 2×1021230155² = 2085822058962648050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227735 + ... + 232175.

It is an arithmetic number, because the mean of its divisors is an integer number (43296174).

Almost surely, 2^1021230155 is an apocalyptic number.

1021230155 is a deficient number, since it is larger than the sum of its proper divisors (364247413).

1021230155 is a wasteful number, since it uses less digits than its factorization.

1021230155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1021230155 is about 31956.6918657110. The cubic root of 1021230155 is about 1007.0272208284.

Adding to 1021230155 its reverse (5510321201), we get a palindrome (6531551356).

The spelling of 1021230155 in words is "one billion, twenty-one million, two hundred thirty thousand, one hundred fifty-five".